BOTH PARENTS SLENDKK. 



57 



Here is a great preponderance of very Blender and Blender offspring— 

 40 out of the 51, and all of the 11 of medium build arc below the 

 middle class. There clearly are factors which driveeven these progeny 



of two slender parents in some cases to become of slightly heavier 

 build than their parents, and this result is to be expected if fleshy 

 build depends on several zygotic factors, and slender build lacks all 

 these factors but two. The distribution of builds in the offspring <>f 

 the selected slender (and very slender) parents is shown in table 23. 

 The percentage distribution of the progeny is: 12 VS, 73 S, L3 M 

 2 F. On any hypothesis we should expect a large proportion of slender 

 offspring. Close conformity to any theoretical distribution is hardly 

 to be expected in this table, owing to the variety of matings included. 



Table 23. — Summary of selected slender x slender matings, and those of very slender parents, 



together with their progeny. 



Detailed family histories of these slender X slender matings are 

 given herewith. 



Ada-4 Family. 



A family of old English American (Massachusetts and Ohio) ~ r "ek. 

 living in Michigan and Kansas. The Father, a merchant, who in youth 

 suffered from brain fever, is living at 77 years, having had at 50 y< 

 the formula 150/71 inches; build 2.1 (30). His 4 gibe are all tail. 11 - 

 father, a farmer, died at 49 years from typhoid. At 10 years his formula 

 160/70 inches; build 2.3 (33). His mother, who had 6 children, and who 

 was always well, died at 65 years from pneumonia. At 10 yean her formula 

 130/69 inches; build 1.9 (27). This side of the house is of prevailill 

 slender to medium build. 



The mother, who has had 3 children and who Buffered in middle aire from 

 rheumatism and colitis, is living at 66 years, having had at .">(> years the 



